The effects of impulsiveness on the noisiness of helicopters are examined by varying the main rotor speed while maintaining a constant airspeed. This resulted in other characteristics of the noise being held relatively constant. Other controlled variables included altitude, side line distance, descent operations, and level flyovers. A description is provided of the concept, experimental design and procedures along with results based on partial analyses of acoustic and subjective response data. No significant improvement in the noisiness predictive ability of EPNL was provided by either proposed or an A-weighted crest factor correction for impulsiveness.
A subjective field study of helicopter blade-slap noise
1978-07-01
Report
No indication
English
A Subjective Field Study of Helicopter Blade-Slap Noise
NTIS | 1978
|Subjective evaluation of helicopter blade slap noise
NTRS | 1978
|Helicopter Noise Blade Slap. Part 2 Experimental Results
NTIS | 1972
|